ckeditor5-1.0.x-dev/templates/ckeditor5-settings-toolbar.html.twig

{% apply spaceless %}
  <fieldset aria-labelledby="ckeditor5-toolbar-configuration" aria-describedby="ckeditor5-toolbar-description">
    <legend id="ckeditor5-toolbar-configuration">{{ 'Toolbar configuration'|t }}</legend>
    <div class="fieldset-wrapper">
      <div id="ckeditor5-toolbar-description" class="fieldset-description">
        {%- trans -%}
          Move a button into the <em>Active toolbar</em> to enable it, or into the list of <em>Available buttons</em> to disable it. Buttons may be moved with the mouse or keyboard arrow keys.
        {%- endtrans -%}
      </div>
      <div id="ckeditor5-toolbar-app"></div>
      {{ form }}
    </div>
  </fieldset>
{% endapply %}